Max OC in 1075t reached?

Hi,
I've set up my new water cooling system, and I got a new 1075t to replace my old 1055t which could not reach 4ghz stable. Not even with 1.5v
Now with the 1075t is a totally different thing. Luckily this chip seems to be much more ocer than the 1055t.
I'm currently running it at 4200 Mhz at 1.4875v with LLC enabled. It goes up to 1.51v on load.
And the problem comes when I try to go higher than 4.2ghz. No matter what voltage I set, it just won't load windows.
I tried 4.35ghz with 1.6v with no luck. I even tried 1.65v and still nothing.

Should I change any other voltage/config to get past the 4.2ghz?
Any comments are welcome!

Is it me or do people just jump up with their OC`s, hoping it will work @ some point? What happend with small steps?

Could try to up Ur NB volt and RAM volt a little.

It's more efficient to ramp up, yea, but its not necessary. On my new 870 I added 20 and picked a little higher core and it's just stuck. Further on I'll definitely take steps. It's all experimental anyway.